Belay



J.. fA. OBERMAIER. RELAY.

APPLICATI'ON FILED APR.5.,1920. Patented May 3 1921.

4 SHEETS-SHEET 2.

J. A. OBEHMAIER.

RELAY.

APPLICATION FILED APR. 5, |920.

Patented May 3,1921.

4 SHEETS-SHEET 3.

JOHN A.` OBERMAIER, OF CHICAGO, ILLINOIS.

RELAY.

To all whom t may concern.'

` Be it known that I,Joi-IN A. OBERMAIER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Relays, of which the following is a full, clear, concise, and

Vexact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to controlling devices or systems of the character generally termed relays.

Consider a variable quantity or action, suoli for instance, as a variable pressure, temperature, motion, or any variable, physical, electrical, chemical, thermal or otherwise and as- -sume that it is desired to cause a secondary action or variation which corresponds to, is in conformity with, in consequence of or a .corrective for the primary variable. Such situations arise where it is desired to measure, indicate, record or integrate the variable under consideration, or where it is desired to operate a regulator or governor designed to keep as nearly constant as possible the primary variable or to keep a definite functional relation between a controlling factor and a resultant to be controlled.

y My invention proceeds upon the theory that given a secondary constant action it may be made to become a variable in substantially exact conformity with the primary variable by modifying the constant action in accordance with the dierential of increase or decrease of the primary variable when considered over short increments of time.

To carry out the theory in my invention I provide means responsive to the first differentialv of the variable with respect to du dt sents the primary variable and t represents the passing of time, and then provide means forsetting up a constant secondary action Vwhich is varied in accordance with the dif-y ferential. for each increment or subdivision of time so that ythe secondary action instead of proceeding as a constant becomes variable time-iii other` Words where y repre- `in substantially exact conformity with the primary action or variable.

'Theoretically it would be necessary to have means responsive to all values of' the first differential of the variable, but in practice I find vthat such is not necessary and for. all curves or variables in which Specification ef Letters Patent.

Patented May 3, i921.

Application ied April 5. 1920. Serial No. 371,527.

the value ofthe first differential is relatively small, namely less than unity (positive or negative) two values (positive and negative) of differential are ample. In fact it is feasible to secure excellent results with two values of the differential (positive and negative) even on variables having relada tively large values of the differential In the simplestform of the invention I may employ a single value for all positive values of the differential and a single value for all negative values of the differential and then maintain the action at that value positive or negative asv the case may be until the responsive device has overtaken the variation of the primary action. Under this scheme of operation it inust inv riably overtake Vthe variation and in fact may overtake the variation by a small amount, but the responsive device will not cease to operate until the second or balancing action has overtaken the primary variation.

In the embodiment which I shall show and describe, this means that the electrorespensive device will remain active after a contact is once closed until suflicient change has been caused thereby to bringthe pointer or member indicating` a change of the primarv variable back to the predetermined position of balance.

I shall now explainr the invention, using a steam flow meter system as an embodiment of the invention, but I do not intend to limit the ,invention to meters or indicators as the invention is capable of use in many other situati-fins sucli as regulators, governors and the like. In fact, I de not want to be bound to any particular use except as the saine may be distinctly specified in the appended claims.

In the accompanying drawings, in which I have illustrated one embodiment of my i invention,

lfor a forward or positive movement of the secondary device or mechanism;

Fig. 4 is a top plan view of the device shown in Fig. 2;

Fig. 5 is a section taken on the line 5-5 of Fig. l showing the detent means for maintubes 2 and are connected to the steam pipe 1, these Pitot tubes being connected by a U- shaped chamber which contains in one limb thereof the resistance el, which is intended to be responsive to differential pressure between the tubes 2 and 3. This difference in pressure is equalized by the conducting liquid 5, which tends to short circuit to a greater or less degree the resistance 4.

The resistance G is controlled by the pressure gage 7 and hence is responsive to the absolute pressure of steam within the pipe 1. It will be understood that the g ge may he graduated in terms of density saice density may be considered a function of pressure in the case of wet or dry saturated steam.

The resistance 8, which is placed in series with the flow controlled resistance l is made a constant but is adj usted to the proper value for the original setting of the Nheatstone bridge 10 in which these resistances are suitably arranged. he fourth resistance 9 is the balancing` resistance. This resistance is provided with suitable contacts 1.1 adapted to be engaged by a moving member 12, such as a pointer or the lille, this pointer being actuated in turn by a suitable electro-responsive device such as the elect-ric motor 13 having' the forward field 1.4i and the reverse field controlling forward or reverse motion of 'the armature of the motor.

l`he pointer 12, in addition to making contact with the proper contacts 11 may move over the grad ated scale 16 to give a visible indication, which indication is a resultant or eraluation of the factors which are considered or measured as will be described later. If it is desired to operate a suitable recording or integrating device, such purpose may be accomplished by means of the shaft the motor or by contacts such as 1T, which are auxiliary to the contacts 11. The resistances enumerated, namely, 41, 6, 8 and 9 are suitably arranged in a VVheatstone bridge as will be apparent from Fig. 1. Considering the resistance 4 as being represented by the symbol R1, the resistance S as represented by the symbol the resistance 6 as being represented by the symbol R3, and the balancing resistance 9 being represented by these resistances are arranged so that from the fundamental law of the Wheatstone bridge, we can deduce that the value of the balancing' resistance is an indication of the value of the amount of steam flowing in the pipe 1. From the law of the Wheatstone bridge We know that Ra= and since R2 has been made a constant, we may write the above equation as follows: RIKRIRZ. This can readily be seen to be correct from the fait that the weight of steam which passes through the pipe 1 increases with the increased rate of fiow and it increases with the pressure or the density of the steam passing therethrough. I have shown the resistances 4 and 8 as placed on the upper side of the VVheatstone bridge and the resistances 9 and 6 as placed on the lower side of the bridge with the galvanometer 18 connected between the two sides of the bridge to indicate when the bridge is in balance. It will at once be apparent that the variations in flow in the steam pipe 1 will be reflected by def ections of the pointer 19 of the galvanometer 18 either to the right or to the left and that this condition of balance can be maintained only by varying the resist-ance 9 in such a manner as to balance the combined variation in How and in density in the pipe 1. This condition of balance is brought about particularly by the differentiating and contact making apparatus illustrated more in detail in Figs. 2 to 8, inclusive.

The function of this piece of apparatus is two-fold. First, it makes a test or measurement of the position of the pointer 19 at short intervals of time. which we may term increments of time, and second, 1t closes contact of an electric circuit through a graduated resistance for a predetermined interval of time in accordance with the position at which the pointer is found at the beginning or end of each individual period. This closure of the Contact actuates the motor 13 or other elcetro-responsive device to vary the position of the contact-making pointer 12 so that the resistance 9 is varied in accordance with the variation of the resistances 4: and 6 to bring the bridge 10 to an approximate condition of balance. The throw of the pointer 19 in either a positive or negative direftion determines or selects the corrective effort which is developed at the electro-responsive device 18 for bringing the bridge to balance through the proper variation of the resist-ance 9.

It will be understood that the particular differentiating and contact-making relay of my invention may be employed in systems other than the one that I have indicated in Fig. 1 and that the pointer 19 may be responsive to any variable whatsoever. In each case, however, it represents by its throw from the central or zero position the extent to which the variable has changed during a given increment of time and the Contact which is selected sets into operation a certain torce which is permitted to operate durincr the next increment of time to produce the secondary action which is in conformity with or a corrective oi' the primary action.

An important feature of the construction which 1 employ is concerned with the iact `hat the pointer 19 is not permitted to go from a positive swing to a negative swing, or vice versa, within any one increment of time. The pointer will be held at the zero Aposition if there is a. tendency to swing past zero, until the end of the period, whereupon it will be 'lree to swing to the other side of the Zero position, yto select the. required contact for bringing about the consequent or corrective effect. As shown in Figs. 2 to 8 inclusive, the pointer 19 comprises a thin iiexible wire which is provided with a loop 20 to insure the desired flexibility without producing t-oo great a strain upon the pivots ot the pointer. The pointer is provided near its outer end with a small block 21 which' is adapted to transmit the motion oi' the platen 22 to the desired one oi' the plungers 23, 24, 25 and 26, or the releasing trigger 27. VThe pointer 19, in the form shown in Figs.y 2 to 8, is controlled by a suitable galvanometer having the permanent magnet 30, which is mounted upon a brass trame member' 31. This brass trame member 31 is in turn connected to a suitable base member or frame plate 32. Since the. details or" such a galvanometer construction are well known,

1 do not :consider itnecessary to describe the same in detail. The upper part ot the galfvanometer has a' brass frame member 33 Vupon which is mounted b v means ot the 'posts 34 and 35, the contact mechanism 36.

This mechanism comprises a central metallic ftrarne or base member 37, to the ends ot which secured the blocks olf insulation 38 and 39. The block 36 bears the insulated contact springs 46, 41 and 42, while the block 39 carries cori-espondingcontact springs 43, 44 and 45. rllhe contact making plungers 23, 24, 25 and 26 extend upwardly through the base member 37 into proximity with `the corresponding contact springs above enumerated. These plusAr rs 23. 24,

2,5 and 26 have enlarged heads at thcr lower ends, which terminate ust above the block 21 on the pointer 19. n pair oil control plates 46 and 47 are loosely mounted on the Vplungers 23 24 and 25-26 respectively.

`These control plates have extending arms 47 and 48 terminating in upwardly extending lingers 49 and 50 respectively` rl`he purpose of these arms and fingers being to prevent the pointer or needle 19 from swinging past the center so long as any one plunger is in raised position.

` The plungers 24, 25 and 26 are adapted "to beheld in raised position for at least asingle period of time, the means for holding them thus raised being more clearly shown in Figs. 5 and 8. Each of the. plungers 23, 24, 25 and 26 is provided with a notch 51, as is clearly shown in Fig. 5. A set of detent plungers 53, 54, and 56 are guided in the block or" base member 37 and in the guiding plates 57, in line with the plungers 23, 24, 25 and 26 with springs 58 tor causing. the ends of the detent pluugers to enter the notches 51 when the corresponding contact controlling plunger is raised. Thus, for instance, assuming that the contact controlling plunger 25 is raised, itA will be held in that position as shown in Fig. 3,-by the detent plunger 55 entering into the notch 51 and holding the contact springs 43 and 44 closed until the releasing trigger 27 is operated. This trigger comprises a bell crank lever having its outer end 27 eXtendin, in line with the heads ot the plungers 23, 24, 25 and 26. rThe pivot ot the trigger is shown at 59 iu Figs. 5 and 7. The rear end 60 of the trigger eX- tends in front of a releasing plate 61 which is attached to the rear end 66, this releasing plate being adapted when'the trigger 27 is raised, to torce back all of the plungers 53, 54, 55 and 56 against the sp ings 58 to release any of the contact making plungers. The detent plungers 53, 54, 55 and 56 are provided with the shoulders or collars 62, which are engaged by the plate 61. rlhe adjustment ot the rear end of the trigger 27 is controlled by the stop screw 63.

The platen 22 i-s mounted upon a plunger 65 and this plunger is guided in a suitable sleeve 66 secured to the base plate 32. This platen is guided by a pair ot guides 66 which play in suitable openings in theguiding plate 67. The lower end oit the'plunger rod 65 is provided with a toot or tappet 68 which is engaged by a suitable cam 69, this cam being operated by a shaft 70 rotating at constant speed. The shaft 7() is preterably driven bv a constant speed motor 71 which may be provided with a suitable speed goifernor as is'well understood in the art.

The springs 40 and 42 are connected through resistances 73 and 74 respectively to the reverse field 15 of the motor 13. ln a similar' manner the contact springs 43 and 45 are connected through resistances 7 5 and 76 to the forward lield 14 ot the motor 13. The .intermediate springs 41 and 44 are connected together through a suitable source of current 77, the other pole of which is connected to the tree terminal ot the motor 13. '.lhe operation ot the system and the relay is as follows: Assuming that the system is in operation, the constant speed motor 71 will vibrate the plunger 65 up and down at a rate dependent upon the desired increment ot time. Upon each upward movement of the plunger 65 the platen 22 will engage the block 21, which is mounted upon the pointer 19. So long as the pointer remains at Zero, or substantially zero position, the block merely engages a trigger 27 and the trigger is operated to thrust back the detent plungers 53, 54, 55 and 56 without any effect upon the rest of the mechanism. As soon as the pointer 19 is moved off of zero, as for instance by an increase in the differential pressure in the two tubes 2 and 3, due to an increased flow of steam in the pipe 1, the pointer 19 we will assume swings to the right as viewed in Figs. 1 and 2 due to the unbalancing of the Vheatstone bridge 10 and the consequent flow of current through the galvanometer 18. The result is that the pointer 19, with its block 21 swings under the head of the plunger 25 so that upon the next periodical rise of the platen 22 the plunger 25 will be forced upward so that the notch 51 of the plunger 25 comes in line with the detent plunger 55, whereupon the spring 58 of said detent plunger will force the end of the detent plunger 55 into the holding notch 51 holding the contact making plunger 25 in raised position. As the plunger 25 is moved upwardly it closes the upper contacts 43 and 44, whereby the circuit is closed through the forward field 14 and the resistance 75 for an interval of time equal to the period between throws of the cam 69 or a multiple thereof. The result is that the motor 13 will rotate in a forward direction a predetermined amount, whereby the indicator 12 moves in a forward direction indicating a greater flow of steam and at the same time increasing the value of the balancing resistance 9 in an effort to bring about a condition of balance of the bridge 10. It will be understood that the form of motor 13 may be varied, or that this motor may be connected through suitable gearing to the contact maker and indicator 12, as these details are not of the essence of the invention.

If the increase of resistance in the resistance 9 is great enough to bring the bridge to the balanced condition the point 19, upon being released, will swing back and approach the zero position at the end of the particular increment of time so that when the plunger 65 rises again the block 21 will lie under the trigger 2 The result will be that on the next rise of the plunger 65 the block 21 will be pressed against the trigger 27 and this trigger will be swung about its pivot to cause the releasing plate 61 to shove backwardly the holding plunger 55, releasing the contact making plunger 25.

Assuming that the advance in the indicating contact maker 12 was greater than required to bring the bridge to the balanced condition and caused a condition of unbalance whereby the pointer 19 would tend to swing to the left, as shown in Figs. 1 and 2. The pointer cannot swing past the central position because of the upraised finger 50, this finger being raised by upward movement of the plate 47, which in turn was moved upwardly by the contact making plunger 25 when it was raised to close the contacts 43 and 44. Consequently the pointer 19 is stopped at the central position until the plunger 65 rises again, whereupon the trigger 27 is raised and the plunger 25 released. Thereafter, on the lowering of the platen 22 the pointer 19 is free to swing to the left, whereupon it may pass under the head of tho plunger 24 and cause closing of the contacts 40 and 41.

If after the pointer has swung to one side sufciently to close the first set of contacts the increment of change is so great that the force which is set in operation is insufficient to equal the said increment. the pointer may swing farther and cause closure of the lower contact spring 42, or 45 as the case may be, whereby a greater force is set into operation to bring about the balancing of the bridge 10.

The Wheatstone bridge is, as I have indicated in my co-pending application, Serial No. 209,839, filed January 2, 1918, an ideal medium for the evaluation of a resultant which depends upon either the product or the quotient of two or more factors. The Wheatstone bridge may also be employed where only a single factor is to be taken into account, such, for instance, as temperature. As pointed out in my co-pending application above referred to, the typical Wheatstone bridge need not be employed in exactly the form shown in Fig. 1 as a balanced coil galvanometer may be employed as an equivalent thereof in some situations.

Furthermore, I do not wish to be limited to the precise constructions or connections which I have shown and described, but intend that all modifications which come within the teaching of my invention and the scope of the accompanying claims shall be held as mere variations.

I wish to call attention to the fact that while but two plungers are shown, it is possible to have either or both plungers raised at the same time so that in reality three possible steps are provided for with three possible variations of effect at the motor 13. Hence it will be apparent that for very short increments of time the three possible values of increment of the balancing resistance are ample.

By the controlling effect of the fingers 49 and 50 it is impossible to have both the forward and the reverse fields of the motor energized at the same time.

In the lower right hand portion of Fig. 1 I have indicated how the device of my invention may operate as a regulator for controlling any desired action, such for instance as the opening of the valve 80 in accordance with the indication given at 16 ci the weight of steam flowing through the pipe 1 or the B. T. U. of 'the steam iiowing in the pipe 1.

The contacts 17 control a resistance 79 in 's accordance with the movement ci' the pointer 12. As this resistance is compared with the resistance 81 which is varied by the position of a rheostat arm 82 in accordance with the setting of the valve 80.

A motor 83 having the forward field 8a andthe reverse iield 85 operates the valve S0 andthe arm 82. rIhe circuit of the motor is controlled by the differential galvanometer 86 which holds the circuit orp the motor 83 open when the resistances bear a definite relation to each other, such for instance, as equality.

rlihis differential galvanometer controls the contacts for the fields 8a and 85 through a relay such as illustrated for controlling the field of the motor 13. I have shown this circuit merely diagrammatically. The relay in this case operates in an ohmmeter system to balance one resistance with another.

`Thus any desired secondary regulating action may be secured in conformity with theprimary action under consideration.

I may also employ the motion developed at the shaft of the motor 13 for causing a certain mechanical action which will in turn set into operation forces for bringing to a predetermined position the pointer 19 which may be controlled by a primary action such, for instance, as pressure. rEhat is to say, instead of securing the balancing action through an electric circuit I may secure the action by a mechanical thermal chemical or other connection.

VI claim: Y

1. In combination, means responsive to a primary variable action, means Ytor creating a secondary constant action approximately equal to said first action, means to vary said constant action at equal intervals of time, means governed by said rst means and responsive to the difference between the secondary raction and the primary action during each interval of time 'for governing the third means, whereby the second action 1s caused to vary substantially as the primary action.

2. In combination, a movable member responsive to the first dierential ot a primary variable with respect to time. an electric motor for causing a controlled secondary action, and means responsive to the position of said movable member for causing a predetermined flow of current through said motor to cause the variations'cit the secondary action in accordance with the primary variable.

'3. In combination, a movable member responsive to the changes in value of a quanf, tity over a given briei'period of time, an

electro-responsive device controlling a second movable member, and means governed by the movable member for each brief period of time to cause a predetermined,quantity of current to flow through the electro-responsive device in accordance with the change in value of said quantity during said brief period of time.

4. The combination of a loiv responsive device, a primary resistance controlled by said device, a balancing resistance, an electrosresponsive device for varying said balancing resistance, a movable member governed by said resistances, means governed by the position oi' said member at equal time intervals oiL short duration for actuating said electro-responsive device to cause said balancing resistance to be suitably varie l.

5. In combination, means responsive to a primary action, a primary resistance ccntrolled by said means, a balancing resistance, an electro-responsive device for varying said balancing resistance, a movable member governed by said resistances, means governed by the position of said member at equal time intervals of short duration 'for actuating said electro-responsive device to cause said balancing resistance to be suitably varied.

6. In combination, a plurality of resistances responsive to a physical manifestation, a balancing resistance, an electro-responsive device for varying said balancing resistance, a movable member governed by said resistances jointly, means governed by the position of said member at equal time intervals oi short duration Jfor actuating said electro-responsive device to cause said balancing resistance to be suitably varied.

7. In combination, a primary resistance varied in' accordance with a primary action, a balancing resistance, an electro-responsive device for varying said balancing resistance, a movable member governed by said resistances, means governed by the position of said member at equal time intervals of short duration for actuating said electro-responsive device and indicating means governed by said electro-responsive device for giving an indication of said primary action.

8. In combination, a primary resistance varied in accordance with a primary action, a balancing resistance7 an electro-responsive device for varying said balancing resistance, a movable member governed by said resistances, means governed by the position et said member at equal time intervals ci short duration iter actuating said electro-responsive device, and measuring means for measuring the primary action.

9. In a relay device, a plurality of circuit controlling Contact members, a swinging member adapted to select one of said devices, Vmeans for periodically actuating the selected device, and means for holding said contact controlling device in actuated position for a predetermined interval of time or a multiple thereof.

10. In combination, a movable pointer, an electro-responsive device, a circuit closer for operating said electro-responsive device in a forward direction, a second circuit closer for operating the electro-responsive device in the reverse direction, means for periodically testing for the position of the pointer with regard to said circuit closer at equal intervals of time, means for holding said circuit closers in closed position for a full period of time, and common means for releasing all of said circuit controllers.

11. In combination, a pair of switch members, means for holding the switch members in closed position, means for releasing' said switch members from said holding means, a movable member to select said switch members or said releasing means, and periodi- .cally actuated means for operating either of said switching means or said releasing means.

12. In combination, a pair of contacts, a plunger for operating said contacts, a detent for holding said plunger when the contacts are closed, a trigger for releasing said detent, a movable pointer for selecting either the plunger or the trigger, and periodically actuated means for operating said plunger or said trigger through the agency of said pointer.

13. In combination, a pair of switch controlling plungers each of said plungers being adapted to control an electric circuit, detent means for holding the plungers 1n actuated position, a trigger having its operating ends interposed between the ends of the plungers and being adapted to release said plungers from said detent means, a periodically actuated element adjacent said plungers and said trigger and a movable pointer carrying a linlr adapted to connect said periodically actuated means with either of said plungers or with said trigger.

14. In combination, a pair of switch controlling plungers each of said plungers bein adapted to control an electric circuit, detentmeans for holding the plungers in actuated position, a trigger having its operating ends interposed between the ends of the plungers and being adapted to release said plungers from said detent means, a periodically actuated element adjacent said plungers and said trigger, a movable pointer carrying a linlr adapted to connect said periodically actuated means with either of said plungers or with said trigger, and means for preventing s movable member from moving past the ti T, ger when one of the plungers is actuated.

15. In combination, an electro-responsive device, a circuit including a larger resists nce and a circuit including a smaller resistaxee for operating said electro-responsive device in a forward direction, a circuit including a larger resistance and a circuit including a smaller resistance for operating said electroresponsive device in the reverse direction, a movable member such as a pointer for selecting' the desired circuits forward or reverse, periodically actuated means for closing the desired circuits, means for holding the desired circuits closed for a predetermined interval of time.

16. In combination, an electro-responsive device, a circuit including a larger resistance and a circuit including a smaller resistance for operating said electro-responsive device in a forward direction, a circuit including a larger resistance and a circuit including a smaller resistance for operating said electroresponsive device in the reverse direction, a movable member such as a pointer for selecting the desired circuits forward or reverse. periodically actuated means for closing the desired circuits, means for holding the desired circuit-s closed for a predetermined interval of time, and means for preventing the closing of a forward and a reverse circuit at the same time.

17. In combination with a member movable in response to a change to be recorded of an indicator, an electro-responsive device for moving said indicator, and periodically operated means controlled by said movable member for energizing said electro-responsive means.

18. The combination with a member movable in response to a change to be recorded of an indicator, an electro-responsive device for moving said indicator, and electric current supplying means controlled by said movable member for transmitting predetermined quantities of current to said electroresponsive device.

19. The combination with a member movable in response to a change to be recorded an indicator, a normally open circuit between a source of current and an electrorcsponsive device for operating said indicator, and telling means controlled by rid morali. member for closing said circuit for a predetermined period of time.

90. The combination with a member movable in response to a change to be recorded an electrical iiulicator, an electro-responsive device for moving said indicator, circuit controllinfr means periodically engaging said movable member when deflected 'for causing current to '[iow through said electro-responsive device.

21. In combination with member movable in response to a change to be recorded of an electro-responsive device, a normally open circuit between a source of current and said electro-responsive device, means controlled by said movable member for periodically closing said circuit and a detent for holding the circuit closed.

22. The combination VWith a member movable in response to a change to be recorded of an indicator,` electro-respoiisive means controlled by said movable member for moving said indicator through different definite distances, depending upon the time it takes for 4said movable member to return to its balanced position.

23. In combination with a member movable in response to a change to be recorded Otan indicator, periodically operated means controlled by said movable member for controlling an electric circuit governing said indicator, and means controlled by said movable member for causing the movement of said indicator through different distances depending upon the extent of deflection ot said movable member.

24:. The combination With a member movable in response to a change to be recorded of an indicator, an Velectro-responsive device, a normally Aopen circuit between a source ot' current and said electrical response device periodically operating, means cooperating with said-movable member for periodically closing said circuit, and means controlled by said movable member for determining'the strength of current passing through said electro-responsive device and the consequent distance of movement of said indicator.

25. The combination with a member movable in response to a change to be recorded of anindicator, an electro-responsive device, a normally opencircuit between a source oi current and said electro-responsive device, a rplurality of Vmeans controlled by said movablelmember for yclosing said circuit for detinite periods of time but otvarious strengths of current and Kmeans for selecting a circuit closing means inaccordance with tlic extent of deflectionof said movable member.

V26. The'combination kwith a member movable in response to a change to be recor-ded of an indicator, an electro-responsive device, a source of current, a plurality ot resistances between saidsource and said electric-responsive device, circuit closing means 'For connecting different resistances in said circuit for causing different degrees of movement of said indicator, and means controlled by said movable member for selecting a Vcircuit closer in accordance with the extent of deflection of said movable member.

27. The combination with' a member movable in response to a change to be indicated t an indicator, a source of current, a circuit between said source and said indicator, plurality Yoi' contacts4 Yfor said circuit for causing' different actions of said indicator, and means controlled by said movable member `tor selectinga circuit closer in accordance vvitli the extent of the deflection or" said movable lmembe'r.

f 128. VThe combination with a member movablein lresponse-to la change to be recorded,

of an indicator, a periodically operated actuating member, said movable member when deflected being engaged by said actuating member, a suitable source of current and an electro-responsive device to move said indicator When said movable member is deflected. Y

29. The combination with a member movable in response to'a change to be measured,`

of a measuring device, an electro-responsive device, a plurality of contacts, a periodically operated member tor engaging said movable member to operate said contacts, said periodically operated member being adapted to close the contacts selected bythe degree of deflection Ot said movable member and the extent of actuation of said electroresponsive device for moving said measuring device being dependent upon'the degree of movement ot said member.

30. The combination with a member movable in response to a change, of a translating device, electro-responsive means for moving said translating device and periodically operated means coperatiiig with said movable means for connecting said electro-responsive device to a suitable source of current.

3l. In combination With a member movable in response to a change, of a translating device, an electro-responsive device for moving said translating device, means periodically engaging said movable member and circuit-controlling means for said electroiesponsive device governed by said movable member when engaged by said periodically operated means for causing the response of said electro-responsive device.v

32. The combination With a member movable in response t0 a change, ot a translating device, a normally open circuit containing a suitable source orp current, an electro-responsive device, and a plurality of current controlling devices periodically operating means coperating With said movable member for closing said circuit through one of said controlling devices.

33. The combination with a member movable in response to a change, of a translating device, an electio-respoiisive'device tor operating said transmitting device and means controlled by said movable member for transmitting a predetermined amount of current through said electro-responsive device for moving said translating device to different delinite distances depending upon the extent of movement of said movable member.

34. The combination'vvith a member movable in response to a change, of a translating device, an electro-responsive device for said translating device, a normally open circuit between a source of povver and said translatingdevice, a plurality of circuit closers controlled by said movable member for closing said circuit Jforv a givenl period of time iio to transmit impulses of different current strength, means toi" selecting the circuit closing means in accordance with the extent of movement of said movable member.

35. The combination with a movable member of an electrical translating device, a source oit current, a. series or" current controlling devices ior causing diilerent degrees of movementof said translating device, and means controlled by said' movable member for selecting a circuit controller in accor-dance with the extent of deflection of said movable member.

36. The combination with a movable member of an electro-responsive device, a normally ope-n circuit, a souice of current, a plurality of contacts for connecting the electro-responsive device to said source in a forward or reverse direction, and periodically operated means cooperating with said movable member ior closing one of said contacts for a predetermined period o'l` time.

37. The combination with a member mevable in response to a change to be recorded, of an indicator, an electro-responsive device for moving said indicator, and an electric circuit adapted to be closed through said device under the control of said movable member, when deliected.

38. rlhe combination with a member movable in response to a change or an electroresponsive device, a source oi current normally disconnected from said electro-responsive device and a periodically operated member cooperating with said movable member for connecting said source oi current with said electro-responsive device for a. predetermined short period of time.

39. The combination With a member movable in response to a change oi an elv ctroresponsive device, a source ot current normally disconnected from said electro-responsive crevice, current modifving means for connecting said source of current with said electro-responsive levice, and a periodically operated member cooperating with said movable member for governing the operation of said current modifying` devices.

40. The combination with a me iber movable in response to a change, of a transmitting device, an electro-responsive device tor operating said transmitting device, a normally open circuit between a source of current and said electro-responsive device, circuit closing means comprising` means -or controlling the strength a d direction of the current and a periocically operated member cooperating ivith said movable member for controlling said circuit closing means.

4l. The combination With a member movable in response to a change, of an electroresponsive device, a source of current, a periodicallyT operated member adapted to engage said movable member, means controlling said translating device, a source oi' current, a periodically operated member adapted to connect said source or current to said electro-responsive device, and means controlled by said periodically operating member 'il said movable member governtlie d ction and strength of the curpassi device.

nrough said electro-responsive ine combination with a mein" er movaoie in response to a change, oi'f a translating device, an electro-responsive device controlling said translating device, a source of current a periodically operating member adapted to connect said source of current to electro-responsive device, means controlled by said operating member and said movable member ior governing the direction and strength of the current passing tliroroh said electro-responsive device, and means for interrupting the flow of current betere the same is reversed.

in combination, a movable member respo sive to a change, an electro-respons've dev'ce, asource oi' current for said ro-responsive devi e, circuit controlling means governineI the application of current n one 'direction 'ough said electro-responsive device, circuit controllmg means governing ne flow ci current through said electro-responsive device in the opposite direction, and means under the control of said movable member for closing one of said circuit controlliig means for a predetermined `period oi time.

d5. n combination, a movable member responsive to a change, an electro-responsive device, a source oi' current for said cetro-responsive device, circuit controlling 'ring the application of curl ti i through said electi'orisponsivi-i device, c uit controlling means ici-ning the tion' of current through said yro-responsive dci-rice in the opposite direction, means under the control of said ble member ior closing one of said circoiitrolling means, for a predetermined Aod olE time., and means for interrupting the loiv oiz current through said electro- YIpensive device for a p edetermined period `re the current is reversed thi'ough said electro-responsive device.

4G. ln combination, a movable member responsive to a variable to be indicated, an electro-responsive device, a plurality of contacts controlling the direction and current strength through said electro-responsive device, a periodically actuated 'member for operating saideircuit closing devices, said movable member being adapted to form connecting means between said periodically actuated member and the selected circuit closing device.

t?. In combination, a movable member responsive to a variable to be indicated, an electro-responsive device, a plurality of contacts controlling the direction and current strength through said electro-responsive device, aV periodically actuated member for operating said circuit closing` devices, said movable member being adapted to form connecting means between said periodically actuated member and the selected circuit closing device, and means for invariably holding the actuated circuit closing device in closed position for a predetermined period of time.

Y 48. lncombination, a movable member responsive to a variable to be indica-ted, an electro-responsive device, a plurality of contacts controlling` the direction and current strength through said electro-responsive device, a periodically actuated member for operating said circuit closing devices, said movable' member being adapted to form connecting means between said periodically vactuated member and the selected circuit `closing device, means for invariably holding the actuated circuit closing device in closed position for a predetermined period of time, andv means for insuring that the circuit will be open for a predetermined periodof time before the current is reversed through the electro-responsive device.

' 49'. The combination with a member movble in response to a change of an electro-responsive device, a constant speed shaft, a periodically .operated member adapted to engage saidV movable member and a series of contact closing devices operated by said periodically operated member and controlled by said movable member for connecting a source of current to said electro-responsive device.

50. The combination with a member movable in response'to a change, of an electroresponsive device, a source of current, a periodically operating platen member, a series of contact plungers having circuit closing means adapted to be engaged by said movablev member upon the rise of said platen member, and means controlled by said circuit closing members for connecting a source of Acurrent with said electro-responsive device tol give the desired strength and direction of current through said electro-responsive device. Y

51'. The combination with a member movablein response to a change, of an electroresponsive device, a source of current, a periodically operating platen member, controlling meansfor connecting said source of current with said electro-responsive device, said periodically operating member being adapted to engage said movable member at different positions dependent upon the eX- tent of deflection of said movable member, whereby said electro-responsive device is connected for predetermined periods of time with said source of current to receive different current strengths.

52. lThe combination with a member movable in response to a change, of an electroresponsive device, a source of current, a periodically operating` member, means for connecting said electro-responsive device with said source of current controlled by said periodically operating member, said periodically operating member being adapted to engage said movable member, said connecting member having connections adapted 'te transmit current of varying strengths depending upon the extent of deflection of said movable member.

53. The combination with a member movable in response to a change of an electroresponsive device, a source of current, a periodically operating member, means for connecting said electro-responsive device with said source of current controlled by said periodically operating member, said periodically operating member adapted to engage said movable member, said connecting means having electrical contacts adapted te transmit current of different direction and strength, depending upon the direction of deflection and the extent of deflection of said movable member respectively.

54. The combination-with a member movable in response to a change of an electroresponsive device, a source of current, a periodically operating plunger having a platen adapted to engage said movable member,-a plurality of contact making plungers controlling contacts for making the source ofV power in different directions orthrough different resistances to said electro-responsive device depending upon the direction and eX- tent of defiection of said movable member.

55. The combination with a member movable in response to a change of an electro-responsive device, a source of current, a periodically operating plunger havingl a platen adapted te engage said movable member, a plurality of contact making plungers controlling contacts for making the source of power in different directions or through different resistances to said electro-responsive device depending upon the direction and eX- tent of deflection of said movable member, and means for holding the contact making plungers in contact making position for a predetermined period of time or a multiple thereof.

56. The combination with a member movable in response to a change of an electroresponsive device, a source of current, a periodically operating plunger having a platen adapted to engage said movable member, a plurality et contact making plungers controlling contacts for malring the source ot power in ditferent directions or through ditt'erent resistant-es to said electro-responsive device depending` upon the direction and eX- tent of deflection ot said movable member, means for holding the contact making plungcrs in contact making position tor a predetermined period ot time or a multiple thereot', and means tor insuring a period et no current flow before the direction oi current is reversed through the electro-responsive device.

57. The combination with a member movable in response to a change, of an electroresponsive device, a source ot current, a normally open circuit between said source and said device, means adapted to engage said movable member tor closing said circuit, said means comprising a plurality ot contacts and being adapted to disengage said movable member before said contacts are opened.

58. The combination with a member movable in response to a change, ot an responsive devis-e, a source ot current, a normally open circuit between said device and said source, a plurality ot con t making devices tor closingy said circuit, means adapted to engage seid movable member 'tor operating sait devices, said means being` disengaged from said movable member betere said circuit closing devices are opened.

59. The combination with a member movable in response to change, ot an electroresponsive device, a. source of current, a normally open circuit between 'said source and said device, circuit closing members, a plurality of actuating members tor said circuit closing members, and a member controlling said actuating members and adapted to engage said movable member, and means for holding said actuating' members in closed position for predetermined period of time.

60. The combination with a member movable in response to a change, ot an electroresponsive device, a source of current, a normally open circuit between said source and said device, a circuit closingmember, a detent therefor, and a member controlling said circuit closing member and adapted engage said movable member, said latter member when engaging said movable inember shifting said circuit closing member under the control ot said detent to retain said circuit closing member in closed position for a predetermined period of time.

61. The combination with a member movable in response te a change, ot an elect-roresponsive device, a source of current, a, normally open circuit between said source and said device, a plurality of circuit closing devices adapted to transmit current in predetermined quantity and direction to said electro-responsive device in accordance with the deflection of said movable member, a. constant speed member and an actuating member operated by said constant speed member to engage said movable member and close said circuit closing devices for a predetermined period ot time.

62. The combination. with a member movable in response to a change, of an electroresponsive device, a source ot' current, a plurality of resistances, contacts for connecting said resistances in series with said source otl power and said device, and means controlled by said movable member for operating said switching means to connect said electro-responsive device through one of 'said resistances to said source of current.

The combination with a member movable in response to a change, of an electroresponsive device, a circuit t'or said device comprising a source of power, switching means tor connecting said source of power in the desired direction to said electro-responsive device, and resistance means con.- trolled by said switching means and a periodically operated member adapted to engage said movable member to actuate the selected switching means.

64. 'lne combination with a member movable in response to a chang` of an electroresponsive device, a source oi current, a circuit, a plurality of resistances, switching means for selectively connecting the source ot` current through one ot said resistances in proper direction to said device, and a periodically operating member adapted to engage said movable member' for selecting the switching member. y 65. The combination with a member movable in response to a change, of an. electroresponsive device, a normally open circuit 'for said device, a continuously rotating member, mechanically operated switching members tor said circuit, and means comprising plunger operated by said rotating member' adapted to engage said movable member t'or operating said mechanical switch controlling devices.

66. The combination with a member movable in response to a change, of an electroresponsive device, a continuously rotating shaft, a plurality ot switching devices, a periodically operated platen member operated by said shaft, said movable member comprising a linl between the platen and the switching devices for operating one of said switching devices, and means tor holding the switching devices in operative position for a predetermined period of time.

67. The combination with a member movable in response to a change, of electro-responsive means, a. continuously rotating member, a plurality ot switching members for controlling a circuit through said electro-responsive means, Va platen operated by said continuouslyy rotating member',y there v being a gap between said platen and said period of time.

68. In combination, a movable member responsive to a change, an electro-responsive means, lmeans for transmitting a predetermined quantity of current through said means in one direction, means for transmittingy a predetermined quantity of current through said means in the opposite direction, and means for holding the circuit of the electro-responsive device open for a predetermined period of time before the current is reversed.

69. The combination with a member movable in response to a change to be measured,

vofan electro-responsive device, a circuit closing member for said electro-responsive device, a continuosly rotating shaft, a plunger operated by said shaft there being a gap between said plunger and said contact operating device, said movable member serving to close said gap, and means for holding the contact closing device closed for a predetermined period of time.

70. The combination with a member movable in response to a change of a circuit closing member, a source of mechanical power normally disconnected from said circuit closing member, said movable member serving as a connection between said source of power and said circuit closing member, a periodically operated member controlled by said source of power and adapted to engage said movable member to operate the circuit closing member during one periodical actuation thereof, and means for holding said circuit closing member closed during said period and means for releasing said holding means only during a subsequent period.

Vtrolling member closed during the period of 71. In combination, a member movable in response to a change, a periodically operating plunger, a circuit closing member adapted to be selected by said movable member and actuated by said periodically operating member, means for holding said circuit conactuation fand means for releasing said circuit. controlling member only during a subse uent period of action.

2. In combination, a movable pointer, a circuit closing plunger, a contact controlled by said plunger, a detent for holding said plunger in actuated position, an operating Vplunger actuated periodically, said movable pointer serving as a connecting link between the operating plunger and the circuit closing plunger, said detent'member being adapted to hold the circuit closing plunger closed during a'complete period of the actuating plunger and releasing means for the detent means capable of actuation only on a subsequent period of operation of the operating plunger.

7 3. rThe combination with a member movable in response to a change, of an electroresponsive device, a source of current normally disconnected from said device, means for coupling said source of current with said electro-responsive device in suitable strength and direction, and al periodically operating member controlled by said movable member for controlling said coupling means.

7 4. rlhe combination with a member movable in response to a change, of an electroresponsive means, a normally open path between a source of current and said responsive means, path closing means for connecting the source of current in suitable strength and direction to said responsive means, and a periodically operating member controlled by said movable member for controlling` said vcurrent and said indicator.

7 6. The combination with a member movable in response to a change to be indicated, of an electro-responsive indicator, a source of current, a plurality of switching means for connecting the'electro-responsive indicator to the source of current for predetermined periods of time, means controlled by said switching means governing the direction and strength of current llow to said electro-responsive indicator, Said movable member governing said means, and a periodically actuated member for actuating said switching means.

77. The method of creating a secondary action in response to a primary variable action by means of an electric circuit which comprises closing the circuit for predetermined short periods of time and varying the strength of the current in accordance with the differential of variation of the primary action with respect to said short periods of time.

78. The method of creating a secondary action in response to a primary variable action by means of an electric circuit which comprises closing the circuit for predetermined short periods of time and varying the strength and direction of current in accordance with the value of the differential of increase or` decrease of the primary action with respect t0 said short periods of time.

79. In a regulator for keeping a given phenomenon constant, a pointer` occupying a definite balancing' position for the desired constant phenomenon, a suitable regulating mechanism, an electro-responsive device 1or movingl said regulating device in either direction When the pointer is deflected until the pointer is brought back to its balanced position, a circuit closer governed by 'the position of the pointer for actuating` said electro-responsive device to cause said regulating device to be suitably varied, means for periodically testing for the position ot the pointer With regard to said circuit closer at equal intervals of time, means for holding said circuit closers in closed posit i and common means ior releasingl the said circuit closers when the point returns to its balanced position.

80. In a regulator, a rheostat with an arm movable simultaneously with the regilatinemechanism such as a valve, damper, rioat, etc., an electro-responsive device 'for cansing said arm and mechanism to be moved in either direction, another resistance varied by the controllingfactor, a galvanometer erned by the relation between the rheostat and the controlling' resistance, a circuit closer governed by the position of the galvanometer pointer i'or actuating said electro-responsive device to cause said balancing rheostat to be suitably va jied, means for periodically testing for the position of the galvanometer pointer With regard to said circuit closer at equal intervals 'of time, means for holding said circuit closers in closed position and means releasing said circuit closer when the galvanometer reads zero.

81. in an ohmIneter, an electrical circuit connected So as to satisfy any method of resistance measurement depending upon either a galvanomcter or dii'ierential galvanoineter pointer being brought to Zero before the unknown resistance can be determined, a galvanometer governed by the resistance of the electric circuit balancingl resistance, an electro-responsive device for varying said balancing resistance until the galvanoineter is brought to Zero, a circuit closer governed by the position of the ,galvanometer pointer for actuating said electro-responsive device to cause said balancin@- resistance to be suitably varied, means Ior periodically testing` for the position of the galvanometer pointer With regard to said circuit closer at equal intervals of time, means tor holding said circuit closers in closed position and common means for releasing` said circuit closer When the galvanometer reads Zero.

n Witness Whereo'j l hereunto subscribe i my name this 3rd day oi April A. D. 1920.

JOHN A. OBERMAIER. 

